Malicious PDF — malware analysis report

Static analysis result for SHA-256 635848957e3e2e7b…

MALICIOUS

PDF

39.6 KB Created: 2020-09-04 14:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c570589fe6f559771640bba3be39b526 SHA-1: 6ecc53836b34f66bf1ac07ad090efff80265ce0d SHA-256: 635848957e3e2e7bc28d57c4d8395474308eff6aa0ef293f0f20ef301bbb58e4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm of numerous external PDF files, with one link pointing to known malicious redirector infrastructure. The ML classifier strongly indicates maliciousness, and the presence of many links suggests an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.link/wix?keyword=bhole+baba+song++pagalworld
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/ed8107_2bb4e52fb8954be0a40eb1760eba1c1a.pdf
    • https://static.usrfiles.com/ugd/8127dd_3d2c6fef1b384651b2c91a231079590e.pdf
    • https://static.usrfiles.com/ugd/b80405_8996e23ec39943e7876d8d3bada43ea4.pdf
    • https://static.usrfiles.com/ugd/bc79a4_5ecb42d387b54c1e96c1f92ed25760fc.pdf
    • https://static.usrfiles.com/ugd/6fd45c_d403569d672b44c3b227f8a6f48cd5aa.pdf
    • https://static.usrfiles.com/ugd/01e791_d013f0b2bc424fdfbf91c3c70b91011d.pdf
    • https://cdn.shopify.com/s/files/1/0438/8411/8171/files/27731235909.pdf
    • https://cdn.shopify.com/s/files/1/0435/2930/6272/files/zikimefofiferelazonikomo.pdf
    • https://cdn.shopify.com/s/files/1/0439/4388/7016/files/45910691804.pdf
    • https://cdn.shopify.com/s/files/1/0432/4635/4594/files/86189782887.pdf
    • https://cdn.shopify.com/s/files/1/0431/8432/4770/files/94831336416.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/lidafumogi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4020/2142/files/ruguvuxetunewevobafipog.pdf
    • https://cdn.shopify.com/s/files/1/0433/6451/5994/files/bathukamma_songs_lyrics_in_telugu_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuketunaxu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000525a.bin
9f4ad6bcd97c7d5f7af0c3fc395e78b616e094b11f915b0ede03bf4c2d6eb672
pdf-font-stream PDF embedded font (sfnt) at offset 0x525A 5504 bytes
font_01_sfnt_off00006515.bin
da2094b70dd6826ed6a605e6ea5078f6b8294889ca9e3ac2882d700af0146a65
pdf-font-stream PDF embedded font (sfnt) at offset 0x6515 14280 bytes